Safety chain lock for a door or similar structure



FIG. 1 is a frontal perspective view of a safety chain lock for a door or similar structure showing our design.

FIG. 2 is a rear perspective view thereof, having the locking bolt in space relation to the lock.

FIG. 3 is a broken front elevational view showing the locking bolt in space relation to the lock.

FIG. 4 is a broken top plan view thereof.

FIG. 5 is a broken left hand view of the locking mechanism.

FIG. 6 is a right hand view of the lock and bolt mechanism. 

The ornamental design for a safety chain lock for a door or similar structure, as shown as described. 